fix engine to template only if matches

@@ -7,7 +7,7 @@ otra_variable= [[{VAR}]]
 
 some environment variables:
 
-Hostname: [[{HOSTNAME}]]
+Term: [[{TERM}]]
 Path Variable: [[{PATH}]]
 Current Working Directory: [[{PWD}]]
 

@@ -7,7 +7,7 @@ otra_variable= [[{VAR}]]
 
 some environment variables:
 
-Hostname: [[{HOSTNAME}]]
+Term: [[{TERM}]]
 Path Variable: [[{PATH}]]
 Current Working Directory: [[{PWD}]]
 

@@ -7,7 +7,7 @@ otra_variable= [[{VAR}]]
 
 some environment variables:
 
-Hostname: [[{HOSTNAME}]]
+Term: [[{TERM}]]
 Path Variable: [[{PATH}]]
 Current Working Directory: [[{PWD}]]
 

@@ -4,8 +4,12 @@ var = [[{variable}]]
 
 otra_variable= [[{VAR}]]
 
+
 some environment variables:
-Hostname: [[{HOSTNAME}]]
+
+Term: [[{TERM}]]
 Path Variable: [[{PATH}]]
 Current Working Directory: [[{PWD}]]
 
+[[{}]]
+

@@ -21,7 +21,7 @@ class MyTemplate(string.Template):
     (?P<escaped>\[\[\{)|
     (?P<named>[_A-Z][_A-Z0-9]*)\}\]\]|
     (?P<braced>[_A-Z][_A-Z0-9]*)\}\]\]|
-    (?P<invalid>)
+    (?P<invalid>^$)
     )
     '''
 
@@ -59,18 +59,23 @@ def engine(ifile,ofile,vars):
 	template= MyTemplate(template_content)
 	
 	#print 'MATCHES:', t.pattern.findall(t.template)
-	outputText = template.safe_substitute(vars)
-	print 'MATCHES:', template.pattern.findall(template.template)
-	
 
-	if printit:
-		print "AFTER TEMPLATE:"
-		#print outputText
-		print outputText.encode('ascii', 'ignore')
-	else:
-		f = open(ofile,'w')
-		f.write(outputText.encode('ascii', 'ignore'))
-		f.close()
+	matches = template.pattern.findall(template.template)
+	print vars
+
+	if len(matches):
+		print '[ MATCHES ] - ', matches
+		outputText = template.safe_substitute(vars)
+		print "[ TEMPLATING ] - %s "%ifile
+
+		if printit:
+			print "AFTER TEMPLATE:"
+			#print outputText
+			print outputText.encode('ascii', 'ignore')
+		else:
+			f = open(ofile,'w')
+			f.write(outputText.encode('ascii', 'ignore'))
+			f.close()
 
 
 
@@ -144,6 +149,7 @@ def main(argv):
 			for filename in files:
 				fullpath = os.path.join(path, filename)
 				if os.path.isfile(fullpath):
+					
 					engine(fullpath, fullpath, vars)
 					count+=1
 				else: